In my opinion, these are the best tools for drawing and using watercolors, as they are waterproof and do not fade. The variety of line thickness is impressive. The 0.03 is the best I have found for very tiny details. The brush pen from the same series, specifically for painting but also for large calligraphy (e.g. on cards), writes in different line thicknesses depending on the angle you hold it and the pressure you apply. Overall, they are excellent markers. Just be careful with the tips as they can easily get bent depending on the roughness of the paper. I use them with great success and durability for drawing over or under watercolor. For writing, while they obviously do the job, they are not ideal in terms of comfort.

Very good pen for painting and sketching. I have had it for a year and the ink is still great. I recommend it 10/10

The most convenient thing I have ever used to write on paper. The first one I bought lasted me 2 years in university classes, without running out of ink!